Soluble, noncorrosive, cutting compound



UNITED STATES PATENT OFFICE SOLUBLE, NONCORROSIVE, CUTTING COMPOUND EmilF. Butts, Tacoma, Wash.

No Drawing. Application July 27, 1931, Serial No. 553,479

2 Claims.

This invention relates to the fluid adapted to be poured on the tool andthe steel, or other hard material, being cut in a lathe, or othermachine tool, for the purpose of keeping the tool .and the I materialbeing cut from overheating, and to lubricate it.

The objects of my invention are:To provide a compound which may beshipped and sold in concentrated form, of about the consistency of thickcream, and which may be diluted with water to any desired degree,depending on the speed of cutting and the nature of the materials beingused; which will effectively cool and lubricate the tool and thematerial being cut, thereby preventing damage to the temper of the tooland preventing its too rapid wear; which is noncorrosive; which does notcling excessively to the material and, therefore, is not wasted butwhich leaves a protective film on the finished material whichefiectivelyresists rust from forming on the exposedsurfaces; whichresults in a noticeably cleaner, more highly polished, work than theusual oils used for similar purposes; which very readily mixes with thediluting water; which is free from lumps both in its concentrated anddiluted forms and, therefore, does not clog the pipes and passages ofthe supply system; which does not gum or cake on the tool or metal; andwhich is cheap and highly eflicient.

Water is the most efiective cooling agent for cooling the tool and thematerial worked, but it is a poor lubricant and also rusts the surfacequickly. Mineral, animal and vegetable oils have a greater lubricatingeffect on the sliding of the chip or shaving over the lip and face ofthe cutting tool and will prevent rust, but they have a very poorcooling effect thereon.

I have found that by blending and emulsifying a mineral oil withvegetable oils, in a certain definite proportion, together with apercentage of water, I am able to produce a soluble compound which is ahighly efficient cooling agent and lubricant, and which, on drying onthe metal, leaves an oily film thereon which greatly resists theformation of rust on the finished surface.

My improved soluble, n'oncorrosive, cutting compound is formed of thefollowing constituents in substantially the proportions indicated:--

Mineral oil 71% to 74% Castor oil 8.25% to 9.5% Rapeseed oil 8.25% to9.5% Liquid potassium hydroxide 8.25% to 9.5% Sodium carbonate 0.60% to1.25%

The base of the compound is formed of the mineral oil, which may be of aparaffine base with a gravity of 21 to 26 Baum; the castor oilingredient is primarily for the purpose of providing an elficientcooling and lubricating agent; the rapeseed oil is used as a diluent aswell as a saponifer; the potassium hydroxide (l370 hydrometer test) isused as an emulsifier; and the sodium carbonate is used to deter orprevent the separation of the ingredients when the compound is dilutedwith water.

My improved compound is prepared in the following manner:--The mineraloil is gradually brought to a temperature of 230 Fahr., and then, whileheat is still being added to it, the several ingredients are added inthe order given in the 7 above formula, while being slowly stirred untilthe mass attains a temperature of not over 360 Fahr. The mass is thenpermitted to cool off to about 240 Fahr., when water is permitted toflow into it. The mass must be continuously 7 stirred to break up anysmall lumps which may be formed by the water. When enough water has beenadded to bring its weight to about 140% to 150% of the original weightthe product should have a consistency, when cool, of thick cream. Thecompound may then be barrelled, or poured into cans or other containers,and shipped or stored.

The compound may be used by dissolving it in cold water in any desiredproportions, usually varying from one part of compound to 2 to 60 partsof water.

Having described my invention, what I claim and desire to secure byLetters Patent, is:

1. A soluble cutting compound consisting of the reaction products ofmineral oil, '71 to 74 parts; castor oil, 8 to 9 parts; rapeseed oil, 8%to 9%, parts; potassium hydroxide, 8 to 9% parts; and sodium carbonate0.6 to 1 parts; mixed and diluted with water.

2. The art of making a soluble cutting compound consisting of heating 71to '74 parts of mineral oil to a temperature of about 230; continuingthe heating and stirring thereinto 8 A to 9 /2 parts of castor oil;continuing the heating and stirring thereinto 8 A, to 9 parts ofrapeseed oil; continuing the heating and stirring thereinto 8% to 9%;parts of liquid potassium hydroxide; stirring thereinto 0.6 to 1 partsof sodium carbonate; heating the mass to about 360; cooling the mass toabout 240; and stirring thereinto about 40 to 50 parts of water.

EMIL F. BUTTS.

